#define _CRT_SECURE_NO_WARNINGS 1
#pragma warning(disable:6031)

#include <stdio.h>
#include <math.h>
int main()
{
	int m = 0;
	int t = 0;
	int s = 0;
	scanf("%d %d %d", &m, &t, &s);
	if (t == 0)
	{
		printf("%d", 0);
		return 0;
	}
	if (m * t <= s)
	{
		printf("%d", 0);
		return 0;
	}
	int num = (int)ceil(s * 1.0 / t );
	printf("%d", m-num);
	return 0;
}